The UICorp is just a class with properties (all value type) like string, int, decimal, enum, DateTime…..

I really have no idea why it gives null exception here.

public class UICorp
{
    public long ID { get; set; }
    public string Name { get; set; } = null!;
    public string? RegNo { get; set; }
    public string? RegNoNew { get; set; }
    public DateTime? RegDate { get; set; }
    [NoUpdate] public string RefID { get; set; } = null!;
    [NoUpdate] public string? RefIssuerID { get; set; }
    [NoUpdate] public string? RefInvestorID { get; set; }
    public enTaxResidentFlag? TaxResident { get; set; }
    public enCorpBusinessStatus? BusinessStatus { get; set; }
    public enCorpStatus Status { get; set; }

    public string? Address1 { get; set; }
    public string? Address2 { get; set; }
    public string? Address3 { get; set; }
    public string? Postcode { get; set; }
    public string? State { get; set; }
    public string? Country { get; set; }
    public string? OfficeNo { get; set; }
    public string? OfficeEMail { get; set; }

    public string? PrincipalAddress1 { get; set; }
    public string? PrincipalAddress2 { get; set; }
    public string? PrincipalAddress3 { get; set; }
    public string? PrincipalPostcode { get; set; }
    public string? PrincipalState { get; set; }
    public string? PrincipalCountry { get; set; }

    public byte[]? OCtrl { get; set; }
}